Can the old patent of the same company be used to invalidate his new patent?

You can't. Patent invalidation is a complex legal issue, which must be evaluated according to different situations. In some cases, the company's old patent may invalidate the new patent, but in other cases, it is impossible. Generally speaking, two patents must have very similar technology or identical requirements, and the former can invalidate the latter.

For example, if one company owns a patent and another company tries to obtain the same patent, the old patent of the first company may invalidate the new patent of the second company. However, if the two patents are not much different, it may not invalidate the new patent of the second company.

In addition, the time difference between the two patents will also affect whether the new patent can be invalidated. If it takes a long time to approve the old patent, the new patent may not be invalidated.

Therefore, whether a company's old patent can be used to invalidate its new patent depends on the technical differences and time difference between the two patents. Therefore, before determining whether a company's old patent can be used to invalidate its new patent, it is best to ask legal experts to evaluate it.